Build a laminar flow nozzle for $15
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- Опубліковано 1 лип 2008
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Forum on this topic, yahoo!
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Full text transcript of this video
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Labeled assembly photo
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Laminar jet lit with two cheap ($1.49) novelty laser pointers.
My video of walking laminar bell
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This video shows how $15 and half an hour of assembly can produce a working barebones laminar flow nozzle that attaches to a garden hose. - Навчання та стиль
I probably watch 20 videos on laminar Flow, and this is easily the best one with Great Expectations of the theory behind
finess3 thanks! if this kind of thing interest you it's now really inexpensive to buy kits from SparkFun or Adafruit and create an electrical cut off using a motor actuator or even electromagnet si the water stops and starts cleanly
I learned a lot about birds and their blood from the video. It was really useful information in addition to the laminar flow. Thank you :)
Thanx for sharing the URL to the forum on your videa ;)
Just remember, it was THIS video that was the beginning of everything :-) including starting the forum..
Thanx
And Cheers :-) :-)
@tomchuk Yes! You are quite perceptive! I keep a pile of 2X4s for my parrots to chew on. When birds grow new feather in the feather are alive inside a finger-nail like shaft, called a pinfeather. One of the birds cracked a pinfeather while playing, so I put styptic powder on the feather, which stopped the bleeding and the feather grew out normally, but not before getting three or four drops of blood on the 2X4. I moved the 2X4 to the toolbox for drilling since dried blood != bird toy.
i have no idea why i just watched this
... a wide diameter PVC pipe, and place ultrasonic fogger strips inside. Ultrasonic foggers vibrate a membrane using electricity and force water into tiny fog droplets. You can get several membranes in a row on some models, or buy single membrane foggers. If you can make a good model of a planer nozzle along the length of the pipe the increased pressure generated by the foggers would force a little (it's a really low pressure differential) fog out the slit-nozzle and create your fog wall.
@scafativ Yeah, the bendy parts add turbulence. we used them for the video because they are the most common straws to find in grocery stores. For nicer fountains we go to restaurant supply stores and buy dainty extra long straight straws that are served with mixed drinks. They are phenomenal. A really cool guy at Washington State University told us he just stuff mesh into his tubes, because there is directional flow all the water is forced to become laminar.
Yeah, you can add a fiber optic line into the stream, these kits are sold for backyard pool fountains. You can also shine light into the stream and have a scattering agent in the water s the stream glitters and glows with color. Ask the question on the laminar forum in the description its all the youtube laminar enthusiasts having a discussion.
great tutorial, thank you.
Thanks! Good luck on your fountain, we tried our design in a smaller pipe, but the laminar stream began to decay only a few feet out of the nozzle. I think because of cutting out some steps and using the cheapest materials we could find we're forced to work large.
I'd appreciate feedback on that--we based it off of two of our old college physics textbooks, but textbooks aren't always accurate.
There are different ways to cut off the flow. We tried the disk idea and it works, but you have to have a splash guard of some kind, or install the whole unit in a box/buried to hide maximize the effect. You'll need a power source of some kind to power the disc, powering the disc spinning using the water pressure from your source doesn't work, since the jet, when cut off and splashing onto the disc, adds friction and stops the disk.
Err no. Smaller witdth means higher flowrate and hence lower pressure, from bernoulli. Easy to see in a Venturi tube. But you don't need that for the theory of 0:47
Open rivers are not really relevant to your case. All that you have to use is conservation of mass. All the water that comes in in the wide part, has to come out on the smaller part. That means that it has to come out a lot faster on the small end. (regarding water as incompressible).
To conclude: really cool video!
Most of the people who have written to us are smart, and already know what a laminar fountain is and just wanna build one--but not all speak English as a first language, or can hear (hence the transcript.) It's about making the video as accessible as possible: Slow and stupid but nothing left to guesswork. There's a bunch of cool laminar videos--the related videos tab shows that stuff right next to our video.
*You make laser light jump like a bunny by dissolving sugar cubes in a tank of water.
We tried a small one, too, and yeah it sucks. You need to have a nice wide chamber to slow the water down and let it all flow in the same direction.
The pads at the bottom breaks up any "direction" the water has to its flow and slow it down so that inside the rest f the chamber there's no eddies or major turbulence. You can actually produce a laminar nozzle that just has crumpled screen door mesh or pads in it, youtube user wbeaty who works at Washington University made one using screen mesh.
Well, since air is super thin you can play with it differently. It would be easier to make a planer laminar jet with air than water, think like a water broom if you've ever used one. You can also use round nozzles, check out Silvent company's site to see their high pressure laminar air nozzles. You'd be working with low pressure though, and many of the problems high powered industry tools have you'd be immune to. My suggestion would be to create a trough out of a (...continued)
To make light appear to jump along the laminar jet mount a $1.49 pet toy laser pointing into the flow at either end, the laser needs to hit the inside of the flow at a 48 degree angle. Because the water is laminar you can only see the light from a few angles unless you add something to scatter the light.
Brush something fuzzy, like the top of some grass that has gone to seed along the edge of the flow near the outlet. Where the grass introduces bubble and turbulence the flow lights up.
@tomchuk pt. 2 Bird blood is thicker than human blood, more sugary, much deeper red and much more of a bitch to clean up. So a little drop wiped up can make a huuuge red smear. They even have bigger red blood cells and clotting agents. A little bit or bird blood is a lot messier than mammal blood.
Doesn't the screen on the outlet of the straws create turbulance?
The flow from the straws to the nozzle must turn a corner to get from an outer straw to a center nozzle. Wouldn't it be better if you could have a gradual change in diameter (funnel) from the straw outlet to the final nozzle?
Cheers.
Great stuff! Thanks! One thing I'm having trouble with is the water pressure. What kind of pump do you use?
For this demonstration I used municipal water pressure. However I have had luck with 400 gallon per hour solar setups as well as tony hobby pumps for fishtanks and desktop fou tains. You can use almost any pump as long as you size your outflow hole to allow for a steady flow rate, usually you have to make a couple of different tests plates to get a sense of how wide you can go. This is a fairly low pressure application, the pressure will determine how high the acr of the fountain is but you do not need a lot of pressure to form a laminar flow. If you have a low pressure situation you can have a laminar jet mounted on wall and create a splashless Arc onto a flat surface, which is beautiful and stupefying to behold. You can also have to low pressure laminar arcs intersect which forms something called a bell, and that is really beautiful, if you have two electronic valves and you regulate the pressure on a program, you can reduce the pressure on one half of the Bell configuration while increasing it on the other and have the Bell Walk horizontally as the streams increase and diminish moving the intersection point.
There are several online forums devoted to the topic that you can find by searching,
@xMelissouillex Turbulent flows are easy, an uneven nozzle, rough pipe, anything that will set water into chaos.
You need a pump that can put out a constant flow with the gallons per minute you need, "GPM." Compare the fountain you're making with commercial set ups, they have installation manuals on the web and you can glean useful knowledge from them. On the date of this post inyopools * com has the specs and installation for Jandy brand laminar heads posted, included suggested minimum flow rates.
Where did you get the test plugs from??? Can't find them anywhere.
Is there a critical reynolds number for this "trajectory type" of flow?
Does the device have to be cylindrical? Or can it work in say rectangle form? Thanks.
@DanishM1Garand @DanishM1Garand See, the only problem I can think of with that is the supersaturated salt water (brine) would kill your water pump. But it would be so easy to change the length of the antenna by changing angle and water pressure. If you can find a ham radio list serve ask around for ILA designs, you can make them for pretty cheap. David Hatch (N9ZRT) has done a bunch on this topic. Google "Ionic-Liquid-Antenna-a-Viable-Antenna-for-Amateur-Radio" for a schematic.
Hi and THANX for a great video :D :D
I just wonder why you must have the green
ed pads in the bottom ??
:)
I did try to build a small version of this using 40-50 straws but not any good result :\
anyway.. THANX again :D
Is it possible to have a laminar flow follow a tube? just its coming up to halloween and I was thinking if you could make this portable the ghostbusters energy beam things would be perfect for this
Hello,
is it possible to make a turbulent flow or is it only done in research centre ?
thanx :)
@WyldeSoul 1:43 "In this example the 2 1/4 inch holes offer half the area of the 1/2 inch hole..." "If you use the same water pressure for the 1/2 inch hole that you use for the pair of 1/4 inch holes you'll probably blow the pair of 1/4 inch holes right off the front of your nozzle!" Not everyone learns through audio. You may want to review the written transcript in the more info box for a clearer way to access the information.
I want to use a piece of 6" pvc. I have a cap but can't find test plugs for this size. The cap is, from the inside, concave. Also since the cap goes on the outside of the pvc pipe and does not go all the way down, therefore in the inside will not be bigger for the last .25". Will that create turbulence or other negative side affect?
Brad Kvanbek www.nationalbuildersupply.com/shop?nid=487563&d=13116-13080&NIBCO_4817T6_1&wmh_cid=240262822&wmh_aid=15354474622&wmh_kid=78044797767&gclid=Cj0KEQjwmLipBRC59O_EqJ_E0asBEiQATYdNh5JJ8_LqZ6tmqJop_UvUmRLTXUCL8DoStpYmSoQoYV0aAmAz8P8HAQ
cool but what kind of protect dose it go to.
I'd guess fiber optics, but mainly my point is just that you should probably have your instruction videos begin with all the cool stuff you can do with the device (so I can decided whether to invest the time in watching the whole thing), then give a brief overview of how it is made. Much of the video is a bit heavy on the details unless you think people are really that stupid.
I strongly suggest looking into Georgia Tech's bioinfomratics program.
DUCT TAPE!
Dear Sir
I also tried for laminar, up to a extend I successes, but after a distance water spread. I use 4" dia pipe and 10" long and water jet hole is 12mm. pump is 18 meter head and discharge 6480 lph. I need water flow rate and pump specification
You want low pressure inside the laminar chamber. With that very high lph you may need a larger laminar chamber. The reason the laminar chamber is wider than the water pipe is to slow the water down and align its molecule.
@@gryphern you mean, increase the pipe dia, low pressure will developed? Or any additional device for low pressure?
Can you make a square hole that makes a square stream of water?
My thinking on that is you would need enough energy to keep your water moving in the direction it was shot out of your die/outlet, such that you overcame surface cohesion. My gut answer is yes but it would probably be a dangerous flow. You could fake it by having water fall from high to low out a square outlet, in a large enough formation where cohesion would not create a round flow, it would be a lot of low pressure water.
@Sillyzombie666 Thanks for the heads up. Anyone who's interested should click on the link to the laminar flow forum in our video's info section, liteglow, another UA-cam member has put together resources on cut offs, and electronics.
Looool-was that blood on the wood :D?
Might you have been better off cutting off the bending parts of the straws?
Great video.
@jaquan123ism @jaquan123ism Once, in a land without hope star metal fell from the sky. The young peasant tape was working the Potash fields when he was struck by the shining quicksilver. Whether he was ready to be a hero or not, his destiny was set in the stones of fate. He would bear the mantel and save the Kingdom. He was...
EPIC DUCT TAPE.
4:27 - is that blood?
...So finally, you'd hang the pipe up high, and the the fog would come out in a smooth, planar, sheet and gravity would move the flow down? (Hmm I think I spelled planar with an 'e' earlier!)
There's a lot of folks, particularly young folks, whom the record and movie industry have scared crapless about intellectual property rights, and well-meaning but uninformed authority figures have taught that they can't touch to the point where they don't know if they can quote a song in a poem. What made you immediately respond that it was copyrighted? Did you think the video was somehow illegal? This could be a good excuse to learn about intellectual property laws in the US and abroad.
duct tape! *quack* lol
(don't worry I get it)
2020
No! There are ~patents~ on many many variations of laminar flow nozzles! Copyright also protect intellectual property, but differently! Right idea, wrong application! Patents are publicly available documents you can read, talk about, and share! But rather than referencing a patent, I used university thesis this is a simplified version of, its year of publishing and its authors, so people could look up the source.
DUCT TAPE!!!!
I pee like this
@macgyver2210 SCREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
They really have *no* clue. It is actually easy to get a laminar flow, but this big box with duct tape and straws fails.
AH! A Challenge! To prove you are not a moron within 30 seconds of reading my reply figure out how to build a device of similar complexity in the world of optics instead of fluid dynamics! Describe how you would make a beam of laser light jump along a curved path like tracing the route of a moving bunny rabbit, the device cannot have moving parts of any kind, just as this flow nozzle doesn't--GO!!! And if you give me the pat answer from optics demonstrations I'll know you cheated!
It seems to me that this video spends far too much time explaining how to build the device, which any moron could figure out in 30 seconds. For instance, do I need someone to show me how to remove a cap from PVC pipe? Answer: I think not. Besides, the real question is why the hell would I want to build something like this anyways? Maybe if more of the 8 minutes were spent showing me what "cool" things this device can be used for I might actually want to build it.